These are some of the filthiest business people you'll ever have the displeasure of hiring to run your security. My guards KNOW I care about their well being but rules demand they are paid through contractors.
The stories about how Alliedbarton treat guards, supervisors and managers are awful. They toss away talent or treat them unfairly just to save a buck. In an industry where people are your product, treating your employees with disrespect is shameful and misleading to your customers.
My recommendation is implement proprietary security or contract stipulations to control the vendors treatment towards your guards (pay, benefits, feedback etc.)else they will abuse your people and send you an overworked rep. manager to do nothing for you. Best not to use them at all.